log
log
(PHP 4, PHP 5, PHP 7)
log — Natural logarithm
Description
float log ( float $arg [, float $base = M_E ] )
If the optional base
parameter is specified, log() returns logbase arg
, otherwise log() returns the natural logarithm of arg
.
Parameters
-
arg
-
The value to calculate the logarithm for
-
base
-
The optional logarithmic base to use (defaults to 'e' and so to the natural logarithm).
Return Values
The logarithm of arg
to base
, if given, or the natural logarithm.
See Also
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.log.php